激光技术, 2012, 36 (6): 814, 网络出版: 2012-11-07
激光冲击20CrNiMo钢表面微造型摩擦学性能研究
Investigation on tribological behaviors of surface micro-forming 20CrNiMo steel under laser shock processing
激光技术 摩擦磨损 晶粒细化 搭接率 微凹坑 laser technique friction and wear grain refinement overlap ratio micro-dimple
摘要
为了探索激光冲击20CrNiMo钢表面微造型摩擦学性能, 从表层微观结构和表面宏观形貌两个角度, 研究了激光冲击强化的方法对20CrNiMo钢表面摩擦磨损性能的影响。采用激光以不同搭接率搭接冲击20CrNiMo钢, 用透射电子显微镜观察激光搭接冲击20CrNiMo钢试样表层微观组织结构, 取得了试样表层晶粒状态的照片; 采用CETR UMT摩擦磨损试验机对其进行摩擦磨损试验, 取得了试样表面摩擦系数和磨损量的数据。结果表明, 激光冲击强化作用可以导致20CrNiM
Abstract
In order to study tribological behaviors of surface micro-forming 20CrNiMo steel under laser shock processing (LSP), the effects of LSP on the friction and wear behaviors of 20CrNiMo steel were investigated through observing micro-structure and measuring the macro-surface profile. Firstly, 20CrNiMo was impacted by overlapping LSP in different overlap ratio, and then micro-structure of surface layer was observed through transmission electron microscope, finally, the pictures for surface layer grain state were obtained. Friction and wear test was conducted by CETR UMT Tribometer, surface friction coefficient and wear volume was obtained. The results indicate that grain refinement happens in the surface layer due to LSP impacting 20CrNiMo. Friction and wear behaviors can be improved obviously because fine grain in the grain refinement layer can restrain fatigue wear on lubricated sliding wear process effectively.
李杨, 裴旭. 激光冲击20CrNiMo钢表面微造型摩擦学性能研究[J]. 激光技术, 2012, 36(6): 814. LI Yang, PEI Xu. Investigation on tribological behaviors of surface micro-forming 20CrNiMo steel under laser shock processing[J]. Laser Technology, 2012, 36(6): 814.